Not sure what Type 4 is, or if it's for you? Wizards' article on the format does a great job showcasing both the format's rules and style of play.
See the stack at CubeTutor.
Type 4 Rules
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Standard Rules
Infinite Mana
You are considered to have infinite mana of all colors and types (including snow) at all times. Type 4's infinite mana allows formerly unplayable, over-costed, and powerful cards their time in the spotlight, from the jankiest of Fallen Empires commons to bulk Standard mythics
One Spell Per Turn
Each player can only cast one spell per turn. This limits some of the explosiveness of having infinite mana, but also makes a playable format. The trick of playing Type 4 requires finding the right time to use your spell for turn and finding ways to exploit the rule. Plays that do not require casting a spell - such as playing a land, cycling a card, or using activated abilities - are highly prized.
House Rules
No Errata
Some stacks allow spells with alternate costs - such as morphs, overloaded spells, etc - to skirt the 'one spell per turn' rule. In an effort to keep the stack friendly for folks new to the format, no such rules apply here. You cast a spell, you cast a spell, that was your spell.
Communal Stack
All players draw from the same library, the entire stack. If cards would be put on the bottom or shuffled in, remove them from the game. All other zones - graveyard, hands, etc. - are considered separate.
Hand Size
Players start with 5 cards in their hand, and max hand size is 5 cards. This rule is taken from Kirblinx's excellent stack, which has provided plenty of inspiration and thought for mine.
Handling Infinity
If two spells are infinitely used to top or stop one another, the defender wins and the instigator loses.
Infinite Mana
You are considered to have infinite mana of all colors and types (including snow) at all times. Type 4's infinite mana allows formerly unplayable, over-costed, and powerful cards their time in the spotlight, from the jankiest of Fallen Empires commons to bulk Standard mythics
One Spell Per Turn
Each player can only cast one spell per turn. This limits some of the explosiveness of having infinite mana, but also makes a playable format. The trick of playing Type 4 requires finding the right time to use your spell for turn and finding ways to exploit the rule. Plays that do not require casting a spell - such as playing a land, cycling a card, or using activated abilities - are highly prized.
House Rules
No Errata
Some stacks allow spells with alternate costs - such as morphs, overloaded spells, etc - to skirt the 'one spell per turn' rule. In an effort to keep the stack friendly for folks new to the format, no such rules apply here. You cast a spell, you cast a spell, that was your spell.
Communal Stack
All players draw from the same library, the entire stack. If cards would be put on the bottom or shuffled in, remove them from the game. All other zones - graveyard, hands, etc. - are considered separate.
Hand Size
Players start with 5 cards in their hand, and max hand size is 5 cards. This rule is taken from Kirblinx's excellent stack, which has provided plenty of inspiration and thought for mine.
Handling Infinity
If two spells are infinitely used to top or stop one another, the defender wins and the instigator loses.
Philosophy and Inspiration
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Big props to the random gentleman who first introduced me to Type 4 back in 2007, when I was first getting serious about Magic. The itch for crazy plays and even crazier situations was never really satisfied in any other format.
Both Tev's and Kirblinx's stacks have provided a huge inspiration for this stack and my philosophy in building, as well as catching me up on the past ten years of Type 4 goodies. While Tev's stack has unfortunately not been updated in several years, Kirblinx continues to update his CubeTutor information.
Both Tev's and Kirblinx's stacks have provided a huge inspiration for this stack and my philosophy in building, as well as catching me up on the past ten years of Type 4 goodies. While Tev's stack has unfortunately not been updated in several years, Kirblinx continues to update his CubeTutor information.
Change Log and House Keeping
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August
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Feudkiller's Verdict > Reap the Past
Fumigate > Soulscour
Wretched Confluence > Phthisis
Blightsteel Colossus
Worldspine Wurm
Necrotic Sliver
Visara the Dreadful
Serra Avatar
Haazda Shield Mate
Hypersonic Dragon
Honored Hydra
Silvos, Rogue Elemental
Stunt Double
Force of Negation
Mindbreak Trap
Commandeer
Dream Fracture
Bone to Ash
Exclude
Scatter Arc
Careful Consideration
Perilous Vault
Ethereal Absolution
Fumigate > Soulscour
Wretched Confluence > Phthisis
Blightsteel Colossus
Worldspine Wurm
Necrotic Sliver
Visara the Dreadful
Serra Avatar
Haazda Shield Mate
Hypersonic Dragon
Honored Hydra
Silvos, Rogue Elemental
Stunt Double
Force of Negation
Mindbreak Trap
Commandeer
Dream Fracture
Bone to Ash
Exclude
Scatter Arc
Careful Consideration
Perilous Vault
Ethereal Absolution
September
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Theros Beyond Death+ updates
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Garna, the Bloodflame > Thryx, the Sudden Storm
Loreseeker's Stone > Allure of the Unknown
Notion Thief > Dream Trawler
Illusory Ambusher > Labyrinth of Skophos
Arachnogenesis > Memory Drain
Tower of Fortunes > Mulldrifter
Mind's Eye > Bag of Holding
Thantis, the Warweaver > Taste of Death
The Scorpion God > Pernicious Deed
Soulfire Grand Master > Sephara, Sky's Blade
Ground Seal > Negate
Mind's Dilation > Thorn Mammoth
Loreseeker's Stone > Allure of the Unknown
Notion Thief > Dream Trawler
Illusory Ambusher > Labyrinth of Skophos
Arachnogenesis > Memory Drain
Tower of Fortunes > Mulldrifter
Mind's Eye > Bag of Holding
Thantis, the Warweaver > Taste of Death
The Scorpion God > Pernicious Deed
Soulfire Grand Master > Sephara, Sky's Blade
Ground Seal > Negate
Mind's Dilation > Thorn Mammoth
Ikoria+ updates
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Angel of Sanctions > Kogla, the Titan Ape
Honored Hydra > Titanoth Rex
Ethersworn Adjudicator > Yidaro, Wandering Monster
Sylvan Reclamation > Neutralize
Crush Contraband > Mythos of Nethroi
Cauldron Dance > Back for More
Sudden Death > Clash of Titans
Blast of Genius > Inspired Ultimatum
Grasp of Fate > The Eldest Reborn
Gaze of Granite > Whirlwind of Thought
Sigil of the New Dawn > Death's Oasis
Vault of the Archangel > Hypothesizzle
Volrath's Stronghold > Drakuseth, Maw of Flames
Vitu-Ghazi, the City-Tree > Zealous Conscripts
Honored Hydra > Titanoth Rex
Ethersworn Adjudicator > Yidaro, Wandering Monster
Sylvan Reclamation > Neutralize
Crush Contraband > Mythos of Nethroi
Cauldron Dance > Back for More
Sudden Death > Clash of Titans
Blast of Genius > Inspired Ultimatum
Grasp of Fate > The Eldest Reborn
Gaze of Granite > Whirlwind of Thought
Sigil of the New Dawn > Death's Oasis
Vault of the Archangel > Hypothesizzle
Volrath's Stronghold > Drakuseth, Maw of Flames
Vitu-Ghazi, the City-Tree > Zealous Conscripts